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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c13fa4141d484c6bb72f879557364d17d70f4107833134403ca40a9b373d2f' 
  AND token = 'zi2bgcFV0105ZYodvehcEHSF6tyh3cb1d4G4ZjYpZbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}